Carburetor devices, including an auxiliary starting carburetor



y 1955 A. MENNESSON 2,754,094

CARBURETOR DEVICES. INCLUDING AN AUXILIARY STARTING CARBURETOR 2 Sheets-Sheet 1 Filed March 25, 1955 July 10. 1956 A. MENNESSON 2,754,094 CARBURETOR DEVICES, INCLUDING AN AUXILIARY STARTING CARBURETOR Filed March 25, 1955 2 Sheets-Sheet 2 N VE N TU R /%D Louis flan/Arse United States Patent Office CARBURETOR DEVICES,

AUXILIARY STARTING CARBURETOR Andr Louis Mennesson, Neuilly-sur-Seine, France, assignor to Society Solex, Neuilly-sur-Seiue, France, a French society Application March 25, 1955, Serial No. 496,865 Claims priority, application France April 5, 1954 3 Claims. (Cl. 26141) INCLUDING AN The present invention relates to carburetor devices including an auxiliary starting carburetor, that is to say a carburetor unit capable of making, and supplying to the induction pipe leading to the engine at a point of said pipe downstream of the throttle valve located therein, a rich fuel mixture for starting the engine.

The chief object of the present invention is to provide a carburetor device of this kind which is better adapted to meet the requirements of practice than those used up to this time.

Such carburetor device includes valve means for controlling the flow of fuel to the auxiliary starting carburetor so that the fuel mixture supplied by said auxiliary starting carburetor is delivered into the suction pipe downstream of the throttle valve. Furthermore, means are provided between said control valve means and the throttle valve so that the throttle valve is partly open when the control valve means are opened, that is to say brought into a position where fuel is fed to the auxiliary starting carburetor. The invention consists essentially in arranging said interconnecting means in such manner that when the control valve means have been opened and the throttle valve partly opened, the control valve means can be closed without the throttle valve being brought back directly to its fully closed position, return of said throttle valve to its fully closed position being possible only by temporarily giving it a supplementary opening.

Other features of the present invention will become apparent in the course of the following detailed description.

A preferred embodiment of my invention will be hereinafter described with reference to the accompanying drawings, given merely by way of example and in which:

Fig. 1 diagrammatically shows, partly in elevation and partly in section, a carburetor device made according to my invention.

Fig. 2 is a partial elevation in a direction at right angles to that of Fig. 1 of said carburetor device including thermo-sensitive control valve means shown in section on the line II II of Fig. 1.

Figs. 3 and 4 are views similar to Fig. 1 showing two different relative positions of the parts.

Fig. 5 is an exploded perspective view of the essential elements of the transmission means interposed between the control valve means and the throttle valve.

The carburetor device is of any suitable general construction. Figs. 1 and 2, reference throttle valve. The carburetor device includes a float chamber 4 for feeding fuel to the auxiliary starting carburetor through a calibrated orifice 5. This auxiliary starting carburetor includes a well 6 vented 2,754,094 Patented July 10, 1956 The auxiliary starting carburetor includes a control valve member 11 rotated by a spindle 12 and provided with radial grooves 13 communicating together. According to its position, this control valve may:

Either connect through its grooves 13 conduit 9 (through which fuel in a cylinder 16, or

Cut 01f the respective connections between said conduits.

In cylinder 16 there is provided a piston 17 urged upwardly by a spring 18. Cylinder 16 is vented at its upper part by a passage 19 and it communicates at its lower part with the induction pipe 2 at a point thereof downstream of throttle valve 3, through a conduit 20.

The arrangement is such that conduit 14 is either closed. or opened by piston 17 and conduit 20 is either opened. or closed by piston 17, respectively, according as to whether the suction downstream of throttle valve 3 is. lower or higher than a predetermined value respectively- When conduit 20 is 17, the communication between conduits 15 and 20 isv still established through small section orifices such as 21..

Control valve member 11 may be actuated, either manually or automatically, for instance by a thermosensitive device such as diagrammatically shown on Fig. 2. This thermo-sensitive device includes a bimetallic strip 22 one end of which is fixed to the spindle 12 of control valve member 11 and the other end of which is engaged in an anchorage 23 carried by a cover 24. This cover 24 is applied in a fluidtight manner on a sup- 1 of the carburetor. Thus is enclosed in a chamber 26 through to c1rculate a stream of air or gas a spring 29 which constantly urges throttle valve 3 toward its maximum closing position.

According to the present invention, the means interposed between control valve member 11 and throttle valve 3 are arranged in such manner that when the conthe displacements of the control valve element are transmitted to the throttle the displacements of the control valve member when said member is moving in the closing direction.

above mentioned members can then move freely.

This frictional effect may act exclusively in the above indicated direction, which is preferable when the con trol valve member is manually act in both directions, that is well as in the closing direction,

opening direction, permit movement of the control ing direction.

This solution is particularly suitable when the control closed, as above stated, by piston.

valve member is actuated by a thermo-sensitive device because the effort exerted by such a device is relatively small. In this case in particular, the desired frictional effect may be obtained by making the cooperating surfaces sufficiently rough.

The drawings show an embodiment of such a device.

On a spindle 30, carried by'thebody 1 of the carburetor, there is mounted an oscillating lever 31 including two arms 32 and 33. Arm 32 extends across the path of travel of a finger 34 carried 'by control valve member 11 and projecting at the periphery thereof. A spring 35, of relatively small str ngth, acting upon lever 31 urges arm 32 toward contact with finger 34. Arm 33 carries a pin 36 adapted to cooperate with the edge 37 of a lever 38 mounted on thespindle 27 of throttle valve 3.

Lever 38 is free to oscillate on spindle 27 between two positions limited by two projections 39 and 40 respectively. in one of these positions, the projection 39 is in contact with an adjustable abutment constituted by a screw 41 carried by a transverse plate 42 formed by a bent extension of a disc 43 fixed on spindle 27. In the other of these positions, projection 40 is in contact with an abutment fixed with respect to spindle 27 and constituted for instance by said plate 42. Thus the angular displacements of lever 38 with respect to throttle valve 3 are limited.

The edge 37 of lever 38 is so shaped that when the control valve member 11 is moved in the opening direction (in clockwise direction in the construction of Fig. 1)., which causes lever 31 to pivot (in anti-clockwise direction), lever 38 tends to be moved in clockwise direction, corresponding to the opening of throttle valve 3, such a movement necessitating a sliding displacement of pin 36 on edge 37 The characteristics of levers 31 and 38 and, in particular, the state of the mutual friction surfaces of pin 36 and edge 37 are such that, when edge 37 is in contact with pin 36, lever 31 cannot pivot. In order to obtain this result, said cooperating surfaces may be made sufficiently rough.

An abutment 44, carried by the body 1 of the carburetor and cooperating with projection 39, limits in one direction the angular displacements of lever 38 and therefore, owing to the provision of screw 41 and projection 39, those of throttle valve 3 in the closing direction (Fig. l). The opening corresponding to idling of the engine is thus limited in an accurate fashion and can be adjusted by means of screw 41. The same abutment 44, cooperating with lever 38 proper, can also limit the angular displacements of lever 38 in the other direction and therefore, owing to the provision of plate 42 and projection 40, those of throttle valve 3 in the opening direction (Fig. 4).

According to a supplementary feature, means are provided for keeping the control valve member out of action when the throttle is opened beyond a predetermined angular value.

For this purpose, for instance, lever 31 carries a third arm 45 disposed across the path of travel of an abutment rigidly fixed to the spindle 27 of the throttle valve, this abutment being for instance constituted by plate 42.

Such a carburetor device works in the following fashion.

When the engine is running, bimetallic strip 22 keeps control valve member 11 closed, as shown by Fig. l. The throttle valve is opened and consequently the edge 37 of lever 38 is not in contact with pin 36 carried by lever 31, and the arm 32 of this lever is kept by spring 35 in contact with the finger 34 of the control valve member 11.

When the engine is stopped, lever 38 is pushed by the throttle valve return spring 29 into the position shown by Fig. 1, the edge 37 of lever 38 being then in contact with pin 36. Whenthe engine has cooled down, the elements of the carburetor device remain in the position shown by Fig. 1, despite the metallic strip 22, due to the friction existing between pin 36 and edge 37.

small action exerted by biengine,

If the driver temporarily actuates the throttle valve in the opening direction by means of the throttle pedal, the spindle 27 of said valve drives, in an anticlockwise direction, plate 42 which, acting upon projection 40, causes lever 38 to pivot and releases lever 31. bimetallic strip 22 can then act on control valve member 11, bringing it into the position shown by Fig. 3 and driving simultaneously, through its projection 34, the arm 32 of lever 31.

The driver can new release the throttle pedal and the elements come into the positions shown by Fig. 1. Lever 38 has its edge 37 applied upon pin 36 so that throttle valve 3 cannot return into the idling position illustrated by Fig. 1, but remains in a more opened position which permits a supplementary air stream necessary for starting to flow past it. Control valve member 11 then occupies a position such that it suitably controls the supply of fuel to the auxiliary starting carburetor.

If, in the position of Fig. 3, the engine is allowed to run, the bimetallic strip is gradually heated up to a higher and higher temperature and the control valve member 11 can then freely turn in the closing direction. But lever 31 remains stopped in the position it occupies by the cooperation of pin 36 .and edge 37. Consequently, the fuel mixture becomes leaner and leaner due to the displacement of the control valve member in the closing direction, but the engine still runs at a relatively high speed because the throttle valve is opened at a relatively great angle.

It is thus possible to run the engine as long as it may be desired at a relatively high speed without using a rich mixture for too long a time and anyway for a time longer than that necessary .since closing down of the control valve member is automatically obtained. This condition is necessary in cold weather to achieve the necessary heating of the cooling water of the engine and of the lubricating oil.

If the driver wishes to slow down the engine, it suffices to depress for a short time the throttle pedal so as to release lever 31. This lever then assumes the position corresponding to that of the control valve member and when the driver releases the throttle pedal, the throttle valve comes into the corresponding position.

When bimetallic strip 22 is sutficiently hot, control member 11 has reached the end of its closing displacement and a slight thrust exerted on the throttle pedal returns lever 31 to the idling position shown by Fig. l. The closing displacement of the throttle valve is then limited by abutment 44 and screw 41 between which the projection 39 of lever 38 is pushed.

If the throttle valve is fully opened (Fig. 4), plate 42 keeps the arm 45 of lever 31 in position and therefore prevents control valve member 11 from opening despite the cooling of bimetallic strip 22 which might happen due to the reduction of the air stream that is flowing along said strip.

Of course, whereas I have described the device with an automatically actuated control valve member, it might be operated manually. In this case, the driver can obtain an accelerated idling without the auxiliary starting carburetor supplying fuel to the engine.

In a general manner, while I have, in the above description, disclosed what I deem to be practical and eflicient embodiments of my invention, it should be well understood that I do not wish to be limited thereto as there might 'be changes made in the arrangement, disposition and form of the parts without departing from the principle of the present invention as comprehended within the scope of the accompanying claims.

What I claim is:

1. In a carburetor device for an internal combustion the combination of an induction pipe leading to said engine, a throttle valve in said induction pipe, resilient means for constantly urging said throttle valve toward closing, an auxiliary starting carburetor opening into said induction pipe at a point thereof downstream of said throttle valve, valve means for controlling the flow of fuel to said auxiliary starting carburetor, and means interposed between said throttle valve and said fuel flo-W control valve means, such that said control valve means can be opened only after said throttle valve has been opened, for preventing direct closing of said throttle valve from opened position to fully closed position when said control valve means are closed after having been temporarily opened, said means interposed between said throttle valve and said fuel flow control valve means including a member arranged to be unidirectionally driven by said control valve means in one direction, resilient means for urging said member in the opposed direction, and a second member operatively connected with said throttle valve with a lost motion, said two members being arranged to engage each other frictionally in such manner as to prevent them from following the closing displacements of said control valve means.

2. A combination according to claim 1 in which the respective cooperating surfaces of said two members are rough so as to provide for their frictional mutual engagement.

3. In a carburetor device for an internal combustion engine, the combination of an induction pipe leading to said engine, a throttle valve pivotable in said induction pipe, a spindle rigid with said valve journalled in said pipe about the valve pivot axis, resilient means for constantly urging said throttle valve toward closing, an auxiliary starting carburetor opening into said induction pipe at a point thereof located downstream of said throttle valve, rotary valve means pivoted about an axis parallel to that of said throttle valve for controlling the flow of fuel to said auxiliary starting carburetor, a finger carried by the periphery of said rotary valve means, a lever rotatable about an axis parallel to the above mentioned axes, said lever including a first branch adapted to cooperate with said finger and a second branch making an angle with the first mentioned one, resilient means for urging said first mentioned branch toward said finger, and another lever rotatable with a limited angular play about said axis, said last mentioned lever including a branch arranged so as frictionally to engage the second branch of the first mentioned lever under the effect of at least one of said resilient means, the frictional engagement of said lever branches being determined to prevent relative slipping of one with respect to the other, in such manner that opening of said rotary valve means is prevented through said levers by said throttle valve in closed position and direct return of said throttle valve into fully closed position after a temporary opening thereof and opening of said rotary valve means is prevented even after subsequent closing of said rotary valve means by the friction between said levers in engagement with each other.

References Cited in the file of this patent FOREIGN PATENTS 397,073 Great Britain Aug. 17, 1933 

